

package com.park.gateway.utils;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;

/**
 * IP地址

 */
public class IPUtils {
	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);

	/**
	 * 获取IP地址
	 *
	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
	 */
	public static String getIpAddr(ServerHttpRequest request) {
    	String ip = null;
        HttpHeaders headers = request.getHeaders();
        try {
            ip = headers.getFirst("X-Forward-For");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = headers.getFirst("Proxy-Client-IP");
            }
//            logger.info("请求ip2:{}", ip);
//            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = headers.getFirst("WL-Proxy-Client-IP");
//            }
//            logger.info("请求ip3:{}", ip);
//            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
//                ip = headers.getFirst("HTTP_CLIENT_IP");
//            }
//            logger.info("请求ip4:{}", ip);
//            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
//                ip = headers.getFirst("HTTP_X_FORWARDED_FOR");
//            }
//            logger.info("请求ip5:{}", ip);
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddress().getAddress().getHostAddress();
            }
        } catch (Exception e) {
        	logger.error("IPUtils ERROR ", e);
        }

//        //使用代理，则获取第一个IP地址
        if(StringUtils.isNotBlank(ip) && ip.length() > 15) {
			if(ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}

        return ip;
    }

}
